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Clade
Subclade

Taxon
Taxon
Neornithischia
Nominal Author
Cooper 1985
2nd Nominal Author
Taxon Status ACTIVE
Comments

Neornithischia was coined by Cooper (1985) and defined by Sereno (1998) as a stem-based taxon and party to a node-stem triplet that also includes Thyreophora and Genasauria. Thus Thyreohpora comprises armored ornithischians and Neornithischia the remainder (ornithopods and marginocephalians). To ensure the inclusion of ornithopods within Neornithischia as a prerequisite for its use, a nested ornithopod (Parasaurolophus walkeri) has been added as a positive taxon qualifier.

Neornithischia (Cooper 1985) and Cerapoda (Sereno 1986) were coined independently and included much of the same taxonomic content. Sereno (1997) adopted and defined (Sereno 1998) Neornithischia (Sereno 1998) as it was the earlier of the two taxa coined. Cerapoda, in contrast, was defined only recently by reapplying the definition used originally for Neornithischia (Weishampel 2004). Cerapoda is regarded here as a junior synonym of Neornithischia.

Potential Synonomy
Cerapoda

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Triceratops horridus Marsh 1889 but not Ankylosaurus magniventris Brown 1908 and including Parasaurolophus walkeri Parks 1922.
Shorthand
> Triceratops horridus but not Ankylosaurus magniventris + Parasaurolophus walkeri Parks 1922.
Definitional Author
Sereno 1998
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Genasuria, Thyreophora
Specifiers
Specifier(s) A
Triceratops horridus
Specifier(s) B
Specifier(s) C
Ankylosaurus magniventris
Qualifiers
+Taxon
Parasaurolophus walkeri
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1998

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All genasaurs closer to Triceratops than to Ankylosaurus.
Latest Record
Sereno 1998:61
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Triceratops, Ankylosaurus
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